An impeachable offense is whatever a majority of the House of Representatives considers it to be at a given moment in history; conviction results from whatever offense or offenses two-thirds of the other body considers to be sufficiently serious to require removal of the accused from office.

Remarks in the U.S. House of Representatives in an effort to impeach Supreme Court Justice William O. Douglas (15 April 1970); recorded in the Congressional Record, vol. 116, p. 11913.